Nickel-plating solution



LQUIS SCETYLTE, OFPIT'ISBUBGH, PENNSYLVANIA, ASSIGNOR NEMOURS & COMPANY,01? WILMINGTON, DELAWARE, A CORPORATION 01? nnnawann.

NICKEL-PLATING SOLUTION.

No Drawing.

To all '21. 710123. it may concern:

Be it known that 1, Louis sorrows, of Pittsburgh, in the county ofAllegheny and in the the State of Pennsylvania, have invented a certainnew and useful Improvement in Nickel-Plating Solutions, and do herebydeclare that the following is a full, clear, and exact descriptionthereof.

The object of my invention is to provide a solution suitable for theelectrodeposition of nickel plate, which solution, although capable ofgeneral application, is particularly adapted for depositing nickel upona highly polished nickel surface.

A. further object of the invention is to provide such a solution whichwill produce a soft, bright and flexible nickel coating, and by means ofwhich the plating operation may be carried out in a relatively shorttime, and having high current activity.

Further objects and advantages of the invention will be in part obviousand in part specificall mentioned in the description containedhereinafter, in which I have disclosed one embodiment of my invention,which embodiment however, is to be considered merely as illustrative ofits principle.

l have found it to be advantageous to employ an alkali salt, such assulfate of sodium in combination with the nickel containing ingredientsof the solution, inasmuch as the sodium salt gives a good conductivityto the solution, thus enabling a higher current to be used, and theplating process to be carried out in a shorter time. The sodium saltalso aids in the production of a flexible nickel deposit having a brightsurface.

The sodium salt is combined in the solution with nickel salts,preferably sulfate of nickel, and a certain amount of double sulfate ofnickel and ammonia. It is also ad vantageous to acidify the bath orsolution to some extent by the addition of a weak acid, such as aceticacid.

I prefer to make up the solution by com- Speoification of LettersPatent. Patented May 24, 1921.

Application filed July 24, 1918. Serial No. 246,531.

bining the above elements in approximately the proportions stated below:

Sulfate of nickel 17% Double sulfate of nickel and ammonia 1. 4% Sulfateof sodium 8. 5% Acetic acid 2. 2% Water 7O. 9%

The proportions of the ingredients how-- ever may be varied to aconsiderable extent without producing any detrimental effect in thenickel deposit.

A solution of the character above described will deposit nickeluniformly upon another nickel surface even though said surface be highlypolished, and the deposit is substantially without peeling orblistering, and still is soft and bright. Such a solution isparticularly useful in plating nickel upon nickel, for instance in theprocess of renovating press polishing plates, as described in myco-pendin ap lication, Serial Number246,532, filed Ju y 24, 1918.

I claim:

1. A nickel plating solution containing sulfate of sodium and single anddouble nickel salts.

2. A nickel platin solution containing sulfate of sodium, nic elsulfate, and double sulfate of nickel and ammonia.

3. A nickel platin solution containin approximately 8%: su fate ofsodium, an 1520% sulfate of nickel.

4. A nickel plating solution containing approximately 8% sulfate ofsodium, 1520% sulfate of nickel, and a relatively small percentage ofdouble sulfate of nickel and ammonia.

5. A nickel plating solution containing sulfate of sodium, single anddouble nickel salts, and a weak-acid.

6. A nickel platin solution containing sulfate of sodium, nic elsulfate, double sulfata of nickel and ammonia, and a weak aci 7. Anickel plating solution containing approximately 8% sulfate of sodium,1T. A nickel plating solution containing 1520% sulfate of nickel, and aweak acid. approximately 8% sulfate of sodium, 15 8. A nickel platingsolution containing 15-20% sulfate of nickel, and about 2% ofapproximately 8% sulfate of sodium, acetic acid.

15-20% sulfate of nickel, a relatively small 12. A nickel platingsolution containing percentage of double sulfate of nickel andapproximately 8% sulfate of sodium,

ammonia, and a weak acid. 1520% sulfate of nickel, a relatively small 209. A nickel plating solution containing percentage of doublesulfate ofnickel and sulfate of sodium, single and double nickel ammonia, andabout 2% of acetic acid.

salts, and acetic acid. In testimony that I claim the foregoing 10. Anickel plating solution containing I have hereunto set my hand.

sulfate of sodium, nickel sulfate, double sulfate of. nickel andammonia, and acetic acid. LOUIS SCHULTE.

